The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 12, 1989
Filed:
Feb. 05, 1988
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A silicon nitride-ceramic is composed of a sintered body including silicon nitride and an additive, and has a columnar crystal of .beta. type silicon nitride substantially parallel to one plane. A method for manufacturing a silicon nitride-ceramic comprises the steps of forming first powder including a needle-shaped crystal of .beta. type silicon nitride by mixing the needle-shaped crystal of the .beta. type silicon nitride with second silicon nitride powder mainly of .alpha. type including an additive, or by heating the second silicon nitride powder at temperature 1500.degree. to 1750 .degree. C. in advance; and sintering the first powder at a predetermined temperature under non-oxidation atmosphere.